I assume based on the question that things must be evenly split but she is doing otherwise? The law is that the will has to be followed as closely as possible. However not every situation is addressed in every will and an executor often has to use personal discretion - especially with dividing up personal property and what not. The parties also may agree to do things a bit differently but that is a settlement. If things cannot be agreed upon you may need to ask a court to decide for you but that is costly and time-consuming.
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Attorney Zelinger is correct. Your sister has a duty to follow the terms of the will, but there is some discretion. For example, as long as the valuation is the same, your sister could distribute one item of tangible personal property (a grandfather clock) to a beneficiary your uncle requested orally, while giving other beneficiaries items of equal value. Good luck to you.
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Generally speaking, the executor must follow the terms of the will and codicils offered and admitted to probate, and the executor is not allowed to deviate from the written terms.
In Texas, for some inexplicable reason, there is no statute as there is in other states allowing a testator to make a separate list disposing of items of tangible personal property without formally amending the will, so it is common for Texas attorneys to include a provision in the will allowing the executor to distribute such items according to the testator's separate instructions. Of course this creates other problems (i.e., the executor has a power of appointment that may or may not have fiduciary duties attached). That said, such a provision is usually limited to tangible personal property. You would have to look at the terms of the will.
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